Oil field fishing tool for rock bits



Oct. 6, 1953 D. STORY 2,654,627

OIL FIELD FISHING TOOL FOR ROCK BITS n Filed July ll, 1949 e" Illu I l 1k www A n. .#.ilr 's Drew Story WWW 5mm Patented Oct. 6, 1953 UNITE STA-T ES PAT ENT F FIC E OILI FIEIJDFISHING TOOL FOR ROCK BITS' Drew Story, Hobbs, N Mex.

Application J lllyffll, 1949, SerialfNo. 104,080

4 Claims., (Cl. 294-6155,)

invention relates to novel and useful improvements in fishing tools to be used in oil elds.

An object of this invention is to recover rock bitsg or any other metallic or magnetizabletool or article which for one reason or another becomes lodged or submerged ina shaft in the ground thereby renderingl further operations in theshat substantially; impossible: until such time aszthef lostarticle has been recovered.

Another object oi. this invention is tol utilize azmagnet; of4 one form orfanother whichis disposedin a. sectionalv caseadabtedfto be lowered mthe'slmftorin the.. ground andywhich includes cutter teeth at, the. lower end-thereoftogether with a lirxerfoiV insulating material separating the. magnet rfrom ,the actualcase.,

. Ancillary objects. and features of novelty will become apparent to those skilled in the art, following the description of the preferred forms of the invention, illustrated in the accompanying drawings, wherein;

Figure 1 is a longitudinal sectional view of one form of the invention;

Figure 2 is a sectional view taken substantially on the line of 2 2 in Figure l and in the direction of the arrows;

Figure 3 is an elevational view, parts being shown in section, of a second form of the invention, differing from the first in that a diiierent type of magnet is utilized;

Figure l is a sectional view taken substantially on the line A-A of Figure 3 and in the direction of the arrows;

Figure 5 is a fragmentary sectional view of a third form of the invention, diiering from the other two forms in that another type of magnet is utilized that is, one which has a battery used in conjunction therewith; and

Figure 6 is a transverse sectional view taken on the line 6 6 in Figure 5 and in the direction of the arrows.

The illustrated forms of the invention have substantially identical casings. Each casing is composed of a dome section I connected with a second section l2 which is, in turn, connected with a bottom section I4. Any number of sections may be interposed in this system, it being only necessary to provide external threads at the ends of the casing so that the union I6 may be applied. Gaskets, if found desirable, may be interposed in the joints.

The dome section lll has an eye i8 at the top thereof adapted for attachment with a cable which may be fixed to a winding drum for lowering purposes.

Theilower section i4 is provided with a' number, of teeth` Zfly alongfv the lower bottom end of the substantially cylindrical case. The teeth are used for leading theztoolin the ground.

The dome section W240i. the; baseis provided with4 an` opening: (unnumbered) which maybe pluggednwhen the; magneti ofu the illustration of Figurel ce2; usedrbutzwhich put to use. in the,VVV embodiment' of the invention shownr in Figure 3. A small grommet 2li;y isdisposecl` inthe openingr within the dome section Ill and has electrical conductors 2&1I passed therethrough. These conductors are fixed to the contacts: 38 and 32- which; are. disposed in thefelectrically insulating plateA Si oftheelectro-magnet 3E.

im.electricallyv insulating liner 401 is disposed in thefcase and is', used for the'purpose of insulating the electro-magnet 36 from the case sections and also for the purpose of insulating the permanent magnet 42 from the case sections.

Referring specically to Figure 1 there is a cross bar M composed of two parts which are passed through threaded openings in the case section I2 and which are connected together by the union 46. An eye bolt 48 depends from the bar or support 44 and has one end threaded in a boss 50 which is xed to the permanent magnet 42. A sleeve type liner 54 is disposed on the outside surface of the permanent magnet for contact with the insulating liner 40.

Referring now specifically to the embodiment of the invention shown in Figure 3, substantially the same structure is utilized including the eye bolts 48 however, the described insulating plate 34 is used as the recipient of threaded end of the eye bolt 48. The substantially conventional electro-magnet 36 which is disposed in the case is spaced from the insulating liner 4U by means of the sleeve type member 58 which is disposed around the electro-magnet.

Reference is now made to Figure 5, wherein the nnal embodiment of the invention is illustrated. The differentiating feature is the utility of a battery 6U which is disposed in the case and which has the lead wires 62 and 64 extending therefrom and terminating in appropriate terminals of the electro-magnet 66. In order to fasten the electro-magnet 66 ultimately to a cross member identical to that seen at 44, the boss 68 on the top of the electro-magnet has a short length of threaded shank 10 disposed therein and also disposed in another boss I2 which is carried by the battery 6D. This connects the electromagnet with the battery from a. mechanical standpoint. The boss 16 which is iixed to the 3 top of the battery 60 receives the eye bolt 18 therein.

In operation the device is lowered into the ground for the purpose of recovering lost articles of a magnetizable nature. By the above described structure this is capable. If the Weight of the device is insufficient, it is only necessary to weight the device further by the addition of another section similar to that shown at I2. Upon contacting the metallic element, the device is brought up by means of a drum and cable or the like.

Having described the invention, what is claimed as new is:

1. A device for recovering rock bits comprising a substantially cylindrical sectional case having an open bottom end with a plurality of teeth therearound, a lining of insulating and cushioning material in said case and Substantially covering the inner Wall of said case, a transverse bar fixed Within said case and having a magnetic element carried thereby for magnetically attracting lost articles, said lining beingdisposed between said magnetic element and said case.

2. In a device for recovering articles of mag-- netizable material, a case consisting of a plurality of sections releasably connected together, a lining of insulating material disposed in said case, a transverse support supported by and disposed in and extending across said case, a magnetic element disposed in said case, and means lining of insulating material disposed in said case, a transverse support supported by and disposed in and extending entirely across said case, a magnetic element disposed in said case, and means secured to said support maintaining said element Yin said case including a vertically disposed bolt, a battery fixed to said bolt and electrically connected with said element.

4. In a 4device for recovering magnetizable articles from a well shaft, a casing having an open lower end, a lining of resilient and insulating material disposed in said casing and substantially covering the inner wall of said casing, an element disposed in said casing and spaced therefrom by said lining, said element being magnetic to attract the magnetizable articles, and means attached to said casing for supporting 'a lowering and lifting means, said lining being disposed between said magnetic element and said case.

DREW STORY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 974,047 Frederickson Oct. 25, 1910 1,094,106 White Apr. 21, 1914 1,439,686 Brandon Dec. 26, 1922 1,589,678 Bornemann June 22, 1926 1,944,169 Cavins Jan. 23, 1934 2,347,759 Wherry May 2, 1944 2,390,339 Ullman et al. Dec. 4, 1945 2,522,294 Noble Sept. 12, 1950 2,525,954 Schabarum Oct. 17, 1950 2,539,435 Kirby Jan. 30, 1951 

